CN101868203B - Wound dressing - Google Patents
Wound dressing Download PDFInfo
- Publication number
- CN101868203B CN101868203B CN200880117222.4A CN200880117222A CN101868203B CN 101868203 B CN101868203 B CN 101868203B CN 200880117222 A CN200880117222 A CN 200880117222A CN 101868203 B CN101868203 B CN 101868203B
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- China
- Prior art keywords
- layer
- wound
- fluid
- filter course
- transport layer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
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- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive plasters or dressings
- A61F13/0203—Adhesive plasters or dressings having a fluid handling member
- A61F13/022—Adhesive plasters or dressings having a fluid handling member having more than one layer with different fluid handling characteristics
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive plasters or dressings
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- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/00051—Accessories for dressings
- A61F13/00063—Accessories for dressings comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/0253—Adhesive plasters or dressings characterised by the skin adhering layer characterized by the adhesive material
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- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
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- A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
- A61M1/91—Suction aspects of the dressing
- A61M1/912—Connectors between dressing and drainage tube
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- A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
- A61M1/91—Suction aspects of the dressing
- A61M1/915—Constructional details of the pressure distribution manifold
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- A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
- A61M1/96—Suction control thereof
- A61M1/962—Suction control thereof having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
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- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
- A61M1/98—Containers specifically adapted for negative pressure wound therapy
- A61M1/984—Containers specifically adapted for negative pressure wound therapy portable on the body
- A61M1/985—Containers specifically adapted for negative pressure wound therapy portable on the body the dressing itself forming the collection container
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- A61M2205/00—General characteristics of the apparatus
- A61M2205/75—General characteristics of the apparatus with filters
- A61M2205/7536—General characteristics of the apparatus with filters allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
Landscapes
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Anesthesiology (AREA)
- Hematology (AREA)
- Dermatology (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Otolaryngology (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Materials For Medical Uses (AREA)
Abstract
A method and apparatus are disclosed for dressing a wound. The apparatus comprises an absorbent layer for absorbing wound exudate, a liquid impermeable, gas permeable filter layer over the absorbent layer, a cover layer comprising at least one orifice and a first liquid and gas permeable transmission layer underlying the absorbent layer. The transmission layer is in fluid communication with the filter layer.
Description
Technical field
The present invention relates to for the method and apparatus of coated wound with for the manufacture of the method for Wound dressing.Especially but not exclusively, the present invention relates to one and can be used for the Wound dressing in body part negative pressure (TNP) therapeutic process, wherein, Wound dressing self as dedicated waste tanks to collect and to store the Wound exudate removing from wound site.
Background technology
Treat and be intended to strengthen for other therapeutic process of TNP therapeutic effect for the body part negative pressure (TNP) that puts on wound, providing and available prior art that using method is relevant of many and device is provided.The example of this prior art comprises the prior art of below listing and briefly describing.
By reducing tissue edema, promoting blood flow and tissue particles, removing excessive exudate, TNP treatment contributes to make wound closure and healing and can reduce bacterial growth and wound infection.And TNP treatment reduces the external disturbance of wound, thereby impels healing faster.
In International Patent Application WO 2O04/037334, device, Wound dressing and method for imbibition, flushing and clean wound are described.In the mode of summarizing very much, this application has been described: carry out treatment of wounds by applying TNP treatment, wherein, to wound imbibition further provide other fluid to rinse and/or clean wound, then by the described fluid wound that comprises Wound exudate and flush fluid by liquid sucking device inhale from and by circulating for the device or the means that make useful material wherein be located away from deleterious material.The material that is of value to wound healing is cycled through Wound dressing again, and the material that is harmful to wound healing is thrown aside in waste collection bag or vessel.
In International Patent Application WO 2005/04670, device, Wound dressing and the method for carrying out clean wound with imbibition, flushing and clean wound are described.The still mode to summarize very much, the invention of describing in this document adopts aspect imbibition, flushing and clean wound and similarly installs with WO 2004/037334, but, it further comprises other important step: provide heater control to turn back to the temperature of the useful material of wound site/coated thing, thereby make it in Optimal Temperature, thereby for example wound is had to the most effective therapeutic effect.
In International Patent Application WO 2005/105180, the apparatus and method for imbibition, flushing and clean wound are described.The mode of still summarizing very much, this document description with above in install like two sections of document categories mentioning, but it has other step: be provided for physiological agents supply and put on wound site/coated thing to impel the device of wound healing.
By reference the content of above-mentioned list of references is incorporated to herein at this.
But, aforementioned means and method are generally only applicable to the patient that seeks medical advice, this be because, equipment therefor is complicated and need to have the personnel of the Professional knowledge of installing described in operation and maintenance about how, but also relatively heavy and heavy, be unsuitable for for example outside hospital environment, easily being moved by patient.
Some patients with relatively serious wound for example do not need to seek medical advice continuously, but it can have benefited from applying longer TNP treatment, and such patient can be at home or working space treatment, therefore needs the TNP therapy equipment that is easy to carry about with one and safeguards.To this, GB-A-2 307 180 has described a kind of portable TNP treatment unit, and it can carry and clip on belt or suspender belt by patient.Thereby negative pressure can be put on to wound site.
In TNP therapeutic process, portable or non-portable treatment unit produces negative pressure in wound site.In the time comprising that the fluid of air and Wound exudate material is removed from wound site, fluid must be collected away from wound site in some mode.In current known treatment unit, conventionally carry out collection and the storage of Wound exudate material by being connected to the dedicated waste tanks for the treatment of modular pump unit.But, use tank can cause treating the suitable heaviness of cell arrangement self and manufacturing cost costliness.And replacing is wherein collected the bag having in the tank of Wound exudate or tank and be can be time-consuming and relatively antihygienic process.
Current known treatment unit also usually comprises the pump for generation of negative pressure.Such pump possibility manufacturing cost is high and relatively heavy.
WO 2007/030601 (being incorporated to by reference herein at this) discloses self-contained type's Wound dressing with micro pump.Be included in Wound dressing self for the pump that wound fluid is drawn into region of no pressure.But, only can be removed by complicated series of steps from the Wound exudate of coated thing.Exudate removes process and is also easy to pollute, and this is because once absorbed layer is completely saturated to Wound exudate, the necessary channel gate of opening in Wound dressing, makes absorbed layer and micro pump removable.It should be understood that such exudate removes that to remove with pump may be time-consuming, and can cause the cross infection between each user.Further problem is, Wound dressing is easy to excessive expansion and breaks.
Summary of the invention
One object of the present invention is to alleviate at least in part the problems referred to above.
An object of certain embodiments of the invention is, provides a kind of for provide negative pressure to assist the method for wound closure and healing in wound site, wherein in therapeutic process, is collected and is stored in Wound dressing from the Wound exudate of wound site suction.
An object of certain embodiments of the invention is, a kind of Wound dressing is provided, and it can be arranged in wound site and comprise the integration pump for produce negative pressure in wound site.And for some embodiment, Wound dressing can be collected any Wound exudate.
According to the first scheme of the present invention, be provided for the device of coated wound, comprising:
Absorbed layer, for absorbing Wound exudate;
Make liquid impermeable but the permeable filter course of gas, it is on described absorbed layer; With
Cover layer, it comprises at least one aperture; Wherein
Described absorbed layer is communicated with described filter course fluid.
According to alternative plan of the present invention, a kind of method that applies body part negative pressure (TNP) in wound site is provided, comprise the following steps:
Get Wound exudate and air from wound site pump, near the neighboring area described wound site is sealed by Wound dressing;
In the absorbed layer of described Wound dressing, collect the Wound exudate of getting from described wound site pump; With
The filter course being communicated with by least one aperture in the cover layer of described Wound dressing with described absorbed layer fluid and emission gases.
Some embodiment of the present invention provides following advantage: disposable Wound dressing can be fixed in wound site, and can be simultaneously for negative pressure and collection and storage Wound exudate are provided in wound site.
Some embodiment of the present invention provides following advantage: do not need discrete treatment unit produce negative pressure and collect and store any Wound exudate in wound site.But Wound dressing can be carried out pumping procedure and Wound exudate collection process.So Wound dressing can be single and uses article, it can not have follow-up use.This has reduced infection risk.
Some embodiment of the present invention provides following advantage: Wound dressing can be used for being collected in the Wound exudate producing in negative pressure treatment process.Pump away from Wound dressing can be connected to Wound dressing and reuse, and Wound dressing self is for collecting Wound exudate and then can being thrown aside after use.
Brief description of the drawings
Embodiment of the invention will be described with reference to drawings will only to pass through hereinafter example now, wherein:
Fig. 1 has exemplified Wound dressing;
Fig. 2 has exemplified the top view of Wound dressing;
Fig. 3 has exemplified a part for Wound dressing;
Fig. 4 has exemplified the exploded view of the Wound dressing with installation pump; With
Fig. 5 has exemplified by the view of the horizontal cross-section of Wound dressing.
In the accompanying drawings, identical Reference numeral indicates identical part.
Detailed description of the invention
Fig. 1 exemplifies by according to the sectional view of the Wound dressing 100 of the embodiment of the present invention.The top view of Wound dressing 100 is illustrated in Fig. 2, and its center line A-A indicates the position in cross section shown in Fig. 1.Should be understood that Fig. 1 exemplifies the general schematic view of device 100.Should be understood that embodiments of the invention can be used for body part negative pressure (TNP) system conventionally.In brief, form, remove excessive exudate and reduce bacterial growth (and infection risk) by reducing tissue edema, promoting blood flow and fine particle tissue, negative pressure wound therapy contributes to " difficult " wound closure and healing of many forms.In addition, described treatment makes wound interference reduction, thereby makes healing faster.
Wound dressing 100 can be positioned in processed wound site.Coated thing 100 forms the annular seal space in wound site.Alternatively, wound encapsulation object can be used for wound intracavity and under coated thing.Compatibly, encapsulating material can be gauze or netted PU foamed materials.
Can expect, the range of negative pressure that embodies device of the present invention can be at approximately-50mmHg to (it should be noted that these pressure are for normal around atmospheric pressure, thereby-200mmHg will be about 560mmHg actually) between-200mmHg.Compatibly, pressure limit can be about-75mmHg between-150mmHg.Alternately, available pressure scope can up to-75mmHg, up to-80mmHg or-more than 80mmHg.And, compatibly, can use the pressure limit lower than-75mmHg.Alternately, spendable pressure limit can be higher than-100mmHg or higher than-150mmHg.
As shown in fig. 1, the lower surface 101 of Wound dressing 100 is provided with wound contact layer 102 alternatively.Wound contact layer 102 can be layer of polyurethane or polyethylene layer or other flexible layer of perforation, and for example by the perforation of thermal spike technique or some alternate manners, or may be made in liquids and gases can be seen through.Wound contact layer has lower surface 101 and upper surface 103.Perforation 104 is the through hole in wound contact layer, and it makes fluid can flow through described layer.Wound contact layer contributes to prevent that tissue ingrowth is to other material of Wound dressing.Bore a hole enough little to meet this requirement but still allow fluid pass through.Wound contact layer also contributes to the whole Wound dressing to keep together and is used as the carrier of optional upper and lower adhesive linkage (not shown).For example, lower pressure-sensitive adhesive layer can be arranged on the downside surface 101 of Wound dressing, and upper pressure-sensitive adhesive layer can be arranged on the upper surface 103 of wound contact layer.Pressure adhesive can be bonding agent or other such bonding agents of silicone or acrylic compounds, and can be formed on the both sides of wound contact layer or be formed on alternatively in the selected side of wound contact layer or be not formed in the side of wound contact layer.In the time adopting lower pressure-sensitive adhesive layer, this contributes to Wound dressing to bond near the skin of wound site.
Optional porous material layer 105, for example froth bed or analog, can be positioned on wound contact layer.This porous layer allows the fluid transmission that comprises liquids and gases to leave wound site and in the upper strata of the Wound dressing that arrives.Layer 105 also contributes to distribute the pressure (as hereinafter described in more detail) being produced by pump, makes whole wound site bear balanced negative pressure.Natural or synthetic reticulated polymer foam or non-woven material can be used as the porous material of porous layer 105.
Transport layer part or do not use transport layer 105 or wound contact layer 102 parts under layers of absorbent material 110 is arranged on and does not use on transport layer 105 or on wound contact layer, absorbed layer lower surface forms wound contact layer.Absorbing material can be foam or non-woven natural or synthetic material, and can comprise or can be alternatively superabsorbent material, and forms the portion of accumulating of the fluid (particularly liquid) removing from wound site.Layers of absorbent material also prevents that the liquid of collecting in Wound dressing from flowing with rolling flowing mode.Absorbed layer 130 also contributes to, by capillarity distributing fluids on whole described layer, to make fluid be sucked and be stored in whole absorbed layer from wound site.This prevents from condensing in absorbed layer region.Because absorbed layer experiences negative pressure in use, thereby absorbed layer material is selected as absorbing liquid under such environment.Superabsorbent material is the example of such material.But, can adopt non-superabsorbent material, even in the time estimating to use sizable negative pressure.Absorbed layer material does not need hydrophilic.Compatibly, can use the material with connected open space.Compatibly, use can be resisted the material of the compression stress of negative pressure, the precommpression FT11M foam of for example being manufactured by foam technology company (Foam Techniques).Compatibly, absorbing material can be selected to prevent that fluid from working as coated thing and discharging to returning while being removed.It should be noted that, if use superabsorbers, such material can resist the compression stress of negative pressure and expand.
Further optional porous material layer 112, for example froth bed or analog, be positioned on absorbed layer.This porous layer allows to comprise that wound site is left in the fluid transmission of liquids and gases and in the upper strata of the Wound dressing that arrives.Layer 112 also contributes to distribute the pressure (as described in more detail hereinafter) being produced by pump, makes whole wound site bear balanced negative pressure.Natural or synthetic reticulated polymer foam or non-woven material can be used as the porous material of porous layer 112.Described material can be identical or different with the material of aforesaid porous material layer 105.
Filter course 130 is arranged on absorbed layer 110.Filter course allow dampness and gas by but do not allow liquid to pass through.The applicable material that is used for the filtering material of filter course 130 is 0.2 micron of Gore within the scope of MMT
tMexpansion PTFE.Also can use larger hole dimension, but may need like this secondary filter layer to guarantee sealing biological load completely.In the time that wound fluid comprises oils and fats, preferably but not necessarily, use oleophobic filter membrane, for example, 1.0 microns of MMT-332 before 0.2 micron of MMT-323.This prevents that oils and fats from stopping hydrophobic filter thing.
The material that should be understood that other type can be used for filter course.More commonly, can use microporous membrane, it is for flat sheet of polymeric material and comprise billions of microcosmic holes.According to selected film, the size range in these holes can be from 0.01 micron to being greater than 10 microns.Microporous membrane is all available in hydrophilic (permeable) and hydrophobic (scolding water) form.Compatibly, use microporous hydrophobic membrane (MHM) according to the Wound dressing 100 of certain embodiments of the invention.For example, PTFE, polypropylene, PVDF, and acrylic copolymer.All these optional polymer can be processed can be hydrophobic and the concrete surface characteristic of oleophobic to obtain.Like this, these films have repulsion the liquid of low surface tension, for example, and Multivitamin preserved material, oils and fats, surfactant, oil, and organic solvent.
MHM barrier liquid, and allow Air Flow to pass through film simultaneously.These films are also high efficiency particle air filters, have eliminated and may have communicable aerosol and granule.The MHM of single-piece is known as the optional thing that substitutes mechanical valve or escape orifice.Like this, comprise MHM, can reduce assembling product cost to improve profit, and improve for patients cost performance.
Filter course 130 thereby gas can upwards be discharged pass through Wound dressing.But, liquid, microgranule and pathogen are included in coated thing.
Make the sealant 140 of gas impermeable extend across the width of Wound dressing.Sealant (it for example can be the polyurethane film on both sides with pressure adhesive) makes gas impermeable, thereby this layer operation is with sealing wound chamber (Wound dressing is disposed thereon).By this way, effective chamber is formed under sealant and in sealant and can sets up between the wound site of negative pressure.Sealant 140 is sealed in filter course 130.For example, by bonding or solder technology sealing.Like this, the gas that leaves coated thing is by filter course and sealant.
Compatibly, sealant material can have high dampness Permeability.For example, Elastollan (brand name) SP9109 being manufactured by BASF.Alternatively, dot pattern disperses acrylic adhesive to can be used for assisting to improve dampness Permeability.Use high humidity Permeability material to be as the advantage of sealant 140, by making dampness distribute the behavior that sees through described film and fall apart in atmosphere, the fluid treatment ability of coated thing can enlarge markedly.Advantageously, due to the high humility realizing when coated with use up to the negative pressure of 250mmHg the material close contact of realizing in the process of described device under with atmospheric pressure, thereby emission rate can be easy to realize 3000g/cm
2the amount of/24 hours.
As shown in fig. 1, the through hole 141 of lattice shape array is arranged in sealant.These through holes make the fluid that comprises gas and liquid can pass through sealant 140.Alternately, in the time using discrete cover layer and sealant, sealant can only extend along the perimeter region of lower surface layer, and wherein sealant seals between outer (more detailed description hereinafter) and filter course.As a result, any gas that leaves wound site must leave by filter course.Liquid remains in the layer under filter course.
Porous material layer 150, for example froth bed or analog, can be positioned on sealant 140.This porous layer allows the fluid transmission that comprises liquids and gases to leave wound site.Layer 150 also contributes to distribute the pressure (as described in more detail hereinafter) being produced by pump, makes whole wound site bear balanced negative pressure.Natural or synthetic reticulated polymer foam or non-woven material can be used as the porous material of layer 150.Described material can be identical or different with the material of lower surface layer 105,112.
Cover layer 160 covers the absorbed layer of Wound dressing 100.Cover layer for example can be polyurethane film, and it is used as antibiotic layer and contributes to effectively to stop liquid to addle.Cover layer also provides globality for coated thing, and makes dampness and gas impermeable.Cover layer keeps together Wound dressing, and structural integrity is provided thus.Upper surface 171 also exists aseptic without dirty surface.As alternative scheme, tectal material can have high dampness Permeability, for example, and Elastollan (brand name) SP9109 being manufactured by BASF.Alternatively, dot pattern disperses acrylic adhesive to can be used for assisting to improve dampness Permeability.Use high humidity Permeability material to be as the advantage of sealant 140, by making dampness distribute the behavior that sees through described film and fall apart in atmosphere, the fluid treatment ability of coated thing can enlarge markedly.Advantageously, due to the high humility realizing when coated with use up to the negative pressure of 250mmHg the material close contact of realizing in the process of described device under with atmospheric pressure, thereby emission rate can be easy to realize 3000g/cm
2the amount of/24 hours.
The single hole 165 that is formed as single hole or hole enclosed construction forms in the central area of upper caldding layer.Hole 165 is communicated with the inlet fluid that leads to pump 170, and pump 170 is arranged on tectal upper surface 171.In when operation, pump 170 by fluid from the wound site under wound contact layer 102 upwards pumping by the first transport layer 105, absorbed layer 110, further transport layer 112, filter course 130, sealant 140 and further transport layer 150 pass through Wound dressing.
Forward Fig. 2 to, wherein exemplify the Wound dressing 100 according to the embodiment of the present invention, wherein visible, the upper surface 171 of cover layer 160 extend radially outward arrive around imbrication in froth bed away from coated Wu center and the borderline region 200 of the central bulged region 201 of absorbed layer 110 in.Fig. 2 also contributes to be illustrated in the position of supratectal pump 170.As shown in Figure 2, the general shape of Wound dressing is the square that has the equal length of side and have radius area 202.It should be understood that Wound dressing according to other embodiments of the present invention can be difformity, for example, rectangle, circle or oval-shaped coated thing.
Fig. 3 exemplifies the details drawing of the borderline region 200 of Wound dressing 100 shown in Fig. 1,2 and 3.As can be seen, cover layer 160 extends in marginal area on foam transport layer 150.At this, cover layer is fastened to sealant 140 and wound contact layer 102.How the perforation 104 that Fig. 3 also contributes to illustrate in wound contact layer 102 extends along froth bed 105 and absorbed layer 110.It should be noted that space 301 shown in Fig. 3 is under sealant 140, and on end in wound contact layer 102 and transport layer 105,112 and absorbed layer 110.Shown in space 301 only for illustrating reason, and in fact transport layer and absorbed layer will tilt to reduce described space a little.In Fig. 3, also exemplify further space 302, it is on sealant, and under tectal inner surface.This is equally also only for illustrating, and in fact because clamping in manufacture method is processed and will avoid these spaces.Those skilled in the art it will also be appreciated that in the time being put to practicality, and Wound dressing will bear negative pressure in the region being limited by cover layer inner surface.Such negative pressure will be easy to make any remaining space dent.
Should be understood that according to embodiments of the invention, wound contact layer is optional.This layer porous towards wound site below in use.Lower porous layer 105, for example netted PU froth bed, for removing of point pairing gas and fluid, makes all wound areas all bear equal pressure.Sealant forms roughly liquid-tight airtight sealing together with filter course on wound.Like this, under sealant, produce the negative pressure by pump 170 pumpings.This negative pressure thereby be applied to target wound site.The fluid that comprises air and Wound exudate is drawn through wound contact layer and meshy surface layer 105.The Wound exudate that is drawn through Wound dressing lower floor is dispersed and is absorbed in absorbed layer, and is collected and stores at absorbed layer.Air and dampness are upwards aspirated by intermediate transport layer 112 and by filter course and sealant passes through Wound dressing.Any material that filter course and sealant tighten together to prevent to be different from dampness and air moves up and passes through Wound dressing.These air and dampness are upwards pumped in fluid intake 300 by pump 170.Pump is the fluid as air and dampness by the discharge of fluid issuing (not shown).
It should be noted that transport layer 150 and cover layer 160 are optional.It is useful that their use is used in (in the time that a part for filter course may become obstruction) process in many orientations.In the time not using discrete cover layer 160, sealant is also carried out the additional functionality that covers coated thing, and will thereby additionally be used as cover layer.
Those skilled in the art will appreciate that cover layer self can be filtered stacked lid if not making cover layer imbrication filter course.Therefore, cover layer can be the outermost layer of Wound dressing, or filter course can be the outermost layer of Wound dressing.It further, alternatively, can use outer (not shown), as long as can see through gas and steam.
Further, alternatively, coated thing can comprise antibacterial, for example nanocrystalline silver-colored agent on wound contact layer and/or the sulfanilamide silver in absorbed layer.These antibacterials can be used alone or use together.These antibacterials are killed respectively the microorganism in microorganism and the absorption base in wound.Further, alternatively, can comprise other active component, for example analgesic, as ibuprofen.And, can use the medicament (for example auxin) of cell activity enhancing or the medicament of inhibitory enzyme activity (for example matrix metallo-proteinase inhibitor, as tissue inhibitor of metalloproteinase (TIMPS) or zinc chelating agen).Further, alternatively, odor adsorption element (for example activated carbon, cyclodextrin, zeolite or analog) can be included in absorbed layer or as the another layer on filter course.
Fig. 4 exemplifies the exploded view of Wound dressing shown in Fig. 1,2 and 3.As shown in Figure 4, the orlop of Wound dressing is the wound contact layer 102 of perforation.It should be understood that before using, another lower protective layer can be felt the lower surface 101 of wound contact layer.Before being put in wound site, Wound dressing just removes protection sheet (not shown).In manufacture process, make the central area 400 of wound contact layer 102 slightly recessed, thereby provide dish-shaped upper surface 103 for wound contact layer.
Transport layer 105 is suitably arranged in the dish-shaped central area 400 of wound contact layer.Froth bed comprises the basal region 401 of essentially rectangular and the array of right cylinder 402.As shown in Figure 4, can use 8 × 8 arrays of post 402.It should be understood that the post that can adopt other quantity.Post 402 has approximate circular cross-section, but it should be understood that and can use the post element with different cross section shape.Compatibly integrated forming of post element 402 and base part 401, but it also can discretely form, its center pillar element for example, is fastened to base part in some applicable mode (passing through adhesive technology).
Absorbed layer 110 is positioned on transport layer 105.Absorbed layer 110 is layers of absorbing material and is included in the through hole 403 forming in the essentially rectangular piece 404 of absorbing material.Through hole with 8 × 8 array settings to overlap with the right cylinder 402 in transport layer below.The quantity that it should be understood that through hole 403 is selected to conform to layout with the quantity of post with pattern.
Intermediate transport layer 112 is base part 405 of the essentially rectangular of porous material (for example reticulated polymer foam), and the array of its center pillar 406 is from the lower surface of substrate 405 to downward-extension.Post 406 overlaps with the position of the through hole 403 in absorbed layer.The post 406 that it should be understood that intermediate transport layer 112 can form or can be fastened to base part 405 by some mode with transport layer base part 405 is integrated.The height separately of the post 402,406 of lower transport layer and intermediate transport layer makes: together with Wound dressing is positioned in time, the upper contact surface of the post 402 of lower transport layer contacts with the lower contact surface of the post 406 of intermediate transport layer.This thus the fluid delivery path by absorbed layer is provided, make in the time that pump 170 operates, the fluid that comprises air and Wound exudate and liquid is passed through absorbed layer from lower area by suction upwards.
The filtering material layer 130 of rectangle is positioned on the upper surface of base part 405 of intermediate transport layer.Filter course stops that fluid moves through.Filter course is suitably 0.2 micron of Gore
tMexpansion PTFE sheet.
Sealant 140 is positioned on filter course 130.Sealant has borderline region and the central area 407 of spill roughly.The downside of sealant 140 thereby recessed.Hole matrix-like with 5 × 5 lattice shape array settings becomes through sealant 140.Away from the sealant in described hole for gas and fluid-tight.If use alternatively the material with high humidity Permeability, sealant will make dampness see through certainly.The fluid that comprises liquids and gases is certainly penetrable by perforation.But, be fastened to filter course 130 on sealant downside and prevent that liquid from penetrating by described hole and preventing that to a certain extent air penetration from passing through described hole.Dampness is penetrable by described hole.
The upper transport layer that is formed as reticulated polymer foam sheet is positioned on the upper surface central area of sealant 140.Upper transport layer is as manifold and diffuser, with disseminating of the negative pressure of assisting to be produced by pump 170.
Cover layer 160 is positioned on sealant and upper transport layer 150.Cover layer has borderline region 200 and central bulged region 201.Cover layer downside thereby present center dish region, to receive protuberance central area, intermediate transport layer, absorbed layer and the lower transport layer of upper transport layer, sealant and filter course.Centre bore 165 be formed on tectal upper surface in the heart.Centre bore 165 is located and is overlapped with the fluid intake 300 of pump 170.Like this, in use, in the time using pump 170, under cover layer 160, produce negative pressure.This negative pressure is distributed with the target wound site being positioned under wound contact layer on whole Wound dressing.When setting up and keeping when negative pressure, Wound exudate and air are upwards aspirated and leave wound site and pass through Wound dressing.Liquid and air are sucked with upwards by the substrate of wound contact layer and the lower transport layer 105 that arrives and upwards by the joint pin in lower transport layer and intermediate transport layer.Certainly, it should be understood that being highly enough to the post of the whole absorbed layer of bridge joint can be arranged on the upper surface of lower transport layer 105 or on the lower surface of intermediate transport layer 112.Alternately, in the time manufacturing Wound dressing, the hole 403 in absorbed layer can be filled to transmit material, for example Thysanophyllum.Any Wound exudate upwards being aspirated by Wound dressing is outwards dispersed from absorbing material in the bore region of absorbed layer.Liquid is collected thus and is stored in absorbed layer.Air and dampness continue upwards to pass through filter course 130 and sealant 140, and loose by row by pump 170.
Fig. 5 exemplifies the horizontal cross-section by Wound dressing, wherein exemplifies the absorbed layer upper surface 404 that comprises hole 403.Each hole 403 is filled with absorbing material, for example, and from the post 402 in lower intermediate layer.
It should be understood that according to some embodiment of the present invention, can be sent to for fluid the fluid communication path of intermediate transport layer from lower transport layer, can be by the neighboring area of lower area and zone line be clipped together and is formed.Like this, fluid transmits the periphery edge along Wound dressing is carried out.Such fluid path can replace the fluid path forming by the post in the hole through in absorbed layer, or alternately can replace such path.This amount by the absorbing material in the layer 110 in the Wound dressing that makes to form in result maximizes.
It should be noted that some other embodiment according to the present invention, expedition pump can be installed to the border of Wound dressing, instead of is installed on top surface.In this case, pipe 401,402 can be directly connected to pump.Subsequently, single uses Wound dressing, thereby can omit pump.Alternatively, pipe can be provided with inserting (click fit) adapter or other easy assembly connector, and described adapter can be connected to corresponding matching connector, and matching connector passes through corresponding pipe joint to expedition pump.By this way, expedition pump can be reused, and the Wound dressing that comprises connection tube and adapter is from can being thrown aside after single uses.
It should be understood that alternately, described pipe can be by single double lumen tube setting.In another alternative scheme, described pipe can arrange by single continuous circular shape pipe, and then described pipe passes the pinch roller of peristaltic pump.
Should be understood that for comprise be arranged on cover layer or coated thing peripheral border region on the embodiment of the present invention of pump for, can comprise integrated power source and control circuit.Alternately, power source can be outside pump and by Remote Installation.Remote power source and/or control circuit have improved the disposable of coated thing, and allow in the time using reserve battery battery recharge.
It should be noted, coated thing in use can " be put upside down " use with an angle or vertically.Therefore, upper and lower benchmark is only for explaining object.
In the time adopting discrete cover layer and sealant, such layer can be made up of identical or different material.
In the description of present specification and the full text of claims, word " comprises " and " comprising " and distortion thereof (for example, as present participle " comprising " and predicate verb " comprising ") mean " including but not limited to ", and it is also not intended to (and not) eliminating other parts, additive, component, complete thing or step.
In the description of present specification and the full text of claims, single contain multiple, unless separately there is requirement in applied environment.Especially, in the time using uncertain statement, its restriction should be understood to include multiple and single, unless separately there is requirement in applied environment.
Feature, entirety, characteristic, compound, chemical part molecular structure or the group described in conjunction with concrete scheme of the present invention, embodiment or example, should be understood to can be used for any other scheme described here, embodiment or example, unless phase objectionable intermingling.
Claims (22)
1. for a device for coated wound, comprising:
Wound contact layer;
Be positioned at the porous layer on wound contact layer, be set to allow fluid transmission to leave wound site, and distribute negative pressure in described wound site;
Absorbed layer, for absorbing Wound exudate, described absorbed layer forms the portion of accumulating of the fluid removing from wound site, and absorbed layer is arranged on porous layer;
Liquid impermeable but the permeable filter course of gas, it is on described absorbed layer; With
Cover layer, covers absorbed layer and comprises at least one aperture;
Wherein said absorbed layer is communicated with described filter course fluid,
Also comprise pump, be set to enter absorbed layer from wound site withdrawn fluid.
2. device as claimed in claim 1, further comprises:
Permeable the first transport layer of liquids and gases, it is under described absorbed layer; Wherein
Described the first transport layer is communicated with described filter course fluid.
3. device as claimed in claim 2, further comprises:
The permeable further transport layer of liquids and gases, it is between described absorbed layer and described filter course.
4. device as claimed in claim 3, further comprises:
Described further transport layer is connected to described the first transport layer, provides the recess that comprises described absorbed layer thus between these two transport layers, and provides fluid path by described further transport layer between described filter course and described the first transport layer.
5. device as claimed in claim 2, further comprises:
Described absorbed layer comprises at least one through hole, described the first transport layer and/or further transport layer comprise at least one post element, and described post element extends through described through hole at least in part to provide fluid communication path by described post element between described filter course and described the first transport layer.
6. device as claimed in claim 5, further comprises:
Described absorbed layer comprises the multiple through holes with lattice shape arranged in arrays, and described the first transport layer comprises multiple post elements, and described post element is at the upper surface place of described the first transport layer and in the position corresponding with the position of described through hole.
7. device as claimed in claim 5, further comprises:
Described absorbed layer comprises the multiple through holes with lattice shape arranged in arrays, and described further transport layer comprises multiple post elements, and described post element is at the lower surface place of described further transport layer and in the position corresponding with the position of described through hole.
8. device as claimed in claim 2, further comprises:
The wound contact layer of perforation, it is under described the first transport layer.
9. device as claimed in claim 8, further comprises:
Adhesive linkage, on its lower surface and/or upper surface in described wound contact layer.
10. install as claimed in claim 8 or 9, further comprise:
Removable protective layer, on its lower surface in described wound contact layer.
11. devices as claimed in claim 1, further comprise:
The 3rd transport layer, it is between described cover layer and described filter course and liquids and gases can be seen through.
12. devices as claimed in claim 1, further comprise:
Make the sealant of fluid impermeable, it is between described filter course and described cover layer and comprise at least one hole.
13. devices as claimed in claim 1, wherein, described cover layer comprises the sealant that makes fluid impermeable with at least one hole.
14. devices as described in claim 12 or 13, further comprise:
Described at least one hole comprises multiple penetrating perforation.
15. devices as claimed in claim 1, further comprise:
Described filter course and cover layer extend radially outward the marginal area that exceedes described absorbed layer, form thus peripheral lip region, and described cover layer and filter course are sealed in described peripheral lip region.
16. devices as claimed in claim 12, further comprise:
Described cover layer and sealant extend radially outward the marginal area that exceedes described absorbed layer, form thus peripheral lip region, and described cover layer and sealant are sealed in described peripheral lip region.
17. devices as claimed in claim 1, further comprise:
Pump element, it and comprises the entrance being communicated with the aperture fluid in described cover layer on described cover layer.
18. devices as claimed in claim 1, further comprise:
Outlet valve, it and is communicated with the aperture fluid in described cover layer on described cover layer, and can be connected to the extraction conduit being communicated with expedition pump element fluid.
19. devices as claimed in claim 1, further comprise:
Antibacterial, it is in wound contact layer and/or in described absorbed layer.
20. devices as claimed in claim 1, further comprise:
Analgesics and/or cytoactive reinforcing agent.
21. devices as claimed in claim 1, wherein, described cover layer is on described filter course, or described filter course is on described cover layer.
22. devices as claimed in claim 1, further comprise: odor adsorption element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410470270.9A CN104382691B (en) | 2007-11-21 | 2008-11-20 | wound dressing |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0722820.8A GB0722820D0 (en) | 2007-11-21 | 2007-11-21 | Vacuum assisted wound dressing |
GB0722820.8 | 2007-11-21 | ||
GBGB0817020.1A GB0817020D0 (en) | 2008-09-17 | 2008-09-17 | Wound dressing |
GB0817020.1 | 2008-09-17 | ||
PCT/GB2008/051090 WO2009066106A1 (en) | 2007-11-21 | 2008-11-20 | Wound dressing |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP (5) | EP3000448B2 (en) |
JP (4) | JP5336508B2 (en) |
CN (2) | CN104382691B (en) |
AU (4) | AU2008327661B2 (en) |
CA (2) | CA2705898C (en) |
DK (2) | DK2214611T3 (en) |
ES (3) | ES2715605T3 (en) |
HU (3) | HUE043133T2 (en) |
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CN2186074Y (en) * | 1993-08-12 | 1994-12-28 | 娄奇华 | Bandage with sterilized cotton |
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